An emergency services worker looks at a derailed tram in Croydon, south London, Wednesday Nov. 9, 2016. A tram derailed in London before dawn on Wednesday, leaving at least 50 people injured and several trapped, the emergency services said. (Steve Parsons/PA via AP)

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LONDON (AP) — British police say five people were killed and more than 50 injured when a tram derailed in south London.

Emergency workers were still at the scene of the derailment in Croydon more than six hours after Wednesday’s early morning crash, trying to free two people trapped in the wreckage of the two-carriage tram that tipped on its side next to an underpass.

British Transport Police said they had arrested a man — reportedly the tram’s driver — and rail accident investigators were probing the cause of the derailment.